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| 型号： | DR-TRC105-450-EV |
| 厂商： | RFM |
| 文件页数： | 52/67页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 450MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 频率： | 447MHz ~ 451MHz |
| 适用于相关产品： | TRC105 |
| 已供物品： | 2 个板，天线，电池 |
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such as the TRC105 ’s data scrambling or Manchester encoding options. The average-referenced threshold run-
ning with a chip rate/ 2*π cutoff frequency is a good choice for the majority of OOK applications.
The peak-referenced threshold is generated from the RSSI signal using a fast attack, slow decay peak detector
emulation. The slicer threshold is immediately set to 6 dB below the peak value of the RSSI signal anytime the
RSSI value exceeds the threshold by 6 dB. The threshold then decays by a configurable dB step when a configu-
rable interval passes without the RSSI signal peaking 6 dB above the threshold. The decay step is configured with
RXCFG15 bits 7..5 as shown in Table 65:
Pattern of Bits 7..5
000
001
010
011
100
101
110
111
Decay Step
0.5 dB
1.0 dB
1.5 dB
2.0 dB
3.0 dB
4.0 dB
5.0 dB
6.0 dB
Table 65
The decay interval is configured with RXCFG15 bits 4..2 as shown in Table 66:
Pattern of Bits 4..2
000
001
010
011
100
101
110
111
Decay Interval
once per chip
once per 2 chips
once per 4 chips
once per 8 chips
twice per chip
four times per chip
8 times per chip
16 times per chip
Table 66
The chip period t CP is equal to the bit period except when Manchester encoding is used. For Manchester encod-
ing, the chip period is equal to ? the bit period:
t CP = 1/BR without Manchester encoding, t CP = 1/(2*BR) with Manchester encoding
Where t CP is in ms and BR is in kb/s. The default values of 0.5 dB per decay step and 1 decay interval per chip
provide a good starting point for most applications. For application environments that contain pulse noise, such as
operation in a band where other FHSS systems are operating, using Manchester encoding and decreasing the
decay interval to twice or four times per chip and/or increasing the decay step to 1 dB will reduce the “blinding”
effect of pulse noise. Multipath flutter tolerance is also improved by using Manchester encoding and decreasing
the decay interval and/or increasing the decay step size.
6.3.3 OOK Transmitter Related Configuration Values
MCFG05 bits 7..6 allow the rise and fall time of the power amplifier regulator to be adjusted. Using the default
component values for R6 and C5 as shown in Figure 2, the rise and fall times for the power amplifier regulator
and the OOK modulation are given in Table 67:
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Page 52 of 67
TRC105 - 05/29/13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DRTU06D06 | 功能描述:时间延迟和计时继电器 180-240VAC/DC 1-60VDC 6A RoHS:否 制造商:Crydom 显示器类型:Hand Dial 电源电压:280 VAC 定时范围: 触点形式: 触点额定值:6 A 端接类型:DIN Rail |
| DRTU24A06 | 功能描述:时间延迟和计时继电器 180-240VAC/DC 24-280VAC 6A RoHS:否 制造商:Crydom 显示器类型:Hand Dial 电源电压:280 VAC 定时范围: 触点形式: 触点额定值:6 A 端接类型:DIN Rail |
| DRTU24A06R | 功能描述:时间延迟和计时继电器 90-140VAC/DC 24-280VAC 6A RoHS:否 制造商:Crydom 显示器类型:Hand Dial 电源电压:280 VAC 定时范围: 触点形式: 触点额定值:6 A 端接类型:DIN Rail |
| DRTU24B06 | 功能描述:时间延迟和计时继电器 90-140VAC/DC 24-280VAC 6A RoHS:否 制造商:Crydom 显示器类型:Hand Dial 电源电压:280 VAC 定时范围: 触点形式: 触点额定值:6 A 端接类型:DIN Rail |
| DRTU24B06R | 功能描述:时间延迟和计时继电器 2-24VAC/DC 24-280VAC 6A RoHS:否 制造商:Crydom 显示器类型:Hand Dial 电源电压:280 VAC 定时范围: 触点形式: 触点额定值:6 A 端接类型:DIN Rail |
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